The Seattle Times reports using video footage from the bus, Seattle police determined Roger Mize instigated an argument with Ronnie Tyler after the men boarded a bus around 11 a.m. Jan. 26, according to the charges.

After boarding behind Mize, charges say Tyler tried to pass him and Mize called Tyler an offensive name.

Charges say a verbal exchange led to Tyler pushing Mize before Mize pistol-whipped Tyler with a gun, striking him in the head and shooting him.

Charges say Tyler shoved Mize out of the bus and Mize fell backward, firing a second round found in the coach's pay box.